Electric motor

Abstract

An electrical motor includes a stator; a rotor attached to an output shaft and supported within the stator; a cylindrical case housing the stator and the rotor inside; ball bearings rotatably supporting the output shaft; and a second cover member closing an opening of the case, the ball bearing being attached to the second cover member. An outer ring of the ball bearing and the second cover member are integrally formed of resin material.

1 . An electrical motor comprising:
 a stator;   a rotor attached to an output shaft and supported within the stator;   a cylindrical case housing the stator and the rotor inside;   a ball bearing rotatably supporting the output shaft; and   a cover member to which the ball bearing is attached, the cover member closing an opening of the case, wherein   an outer ring of the ball bearing and the cover member are integrally formed of resin material.   
     
     
         2 . The electrical motor according to  claim 1 , wherein
 the cover member and the case are formed integrally.   
     
     
         3 . The electrical motor according to  claim 1 , further comprising
 a control device provided on opposite side of the cover member from the stator and the rotor, the control device being configured to control electrical signals output to the stator or the rotor.   
     
     
         4 . The electrical motor according to  claim 1 , wherein
 the electrical motor has a plurality of ball bearings, and the plurality of ball bearings are disposed in an axial direction of the output shaft to constitute a multi-row ball bearing.